CN102556041A

CN102556041A - Coast stop vehicle and coast stop method

Info

Publication number: CN102556041A
Application number: CN2011102874105A
Authority: CN
Inventors: 青山训卓; 山田直弘; 立胁敬一; 渡边真一郎
Original assignee: JATCO Ltd
Current assignee: JATCO Ltd
Priority date: 2010-10-06
Filing date: 2011-09-26
Publication date: 2012-07-11
Anticipated expiration: 2031-09-26
Also published as: JP5542607B2; EP2439121A3; CN102556041B; JP2012082847A; US20120088629A1; EP2439121A2; KR101356264B1; US8771141B2; KR20120035888A

Abstract

The invention provides a coast stop vehicle and coast stop method capable of stopping the driver power when driving, and suppressing decrease of oil pressure. The vehicle includes a variator (20) which continuously changes a speed ratio by changing a winding diameter of a belt (23) mounted on pulleys (21,22), a sub-transmission mechanism (30) connected in series with the variator (20) and shifting discrete gear positions by changing engaged states of a plurality of frictional engagement elements (32,33,34), and a coast stop unit (12) which stops the rotation of the drive power source (1) and releases the engaged frictional engagement element when the coast stop condition holds during travel. The coast stop unit includes a coast stop prohibiting unit which prohibits the coast stop regardless of the coast stop condition when it is predicted at the time of determining whether or not the coast stop condition holds that a belt tightening force of the pulley (21;22) falls below an engaging force of the frictional engagement element in the engaged state by the execution of the coast stop.

Description

Idle stop vehicle and idle running method of shutting down

Technical field

The present invention relates to a kind of idle stop vehicle, it can make drive force source stop under steam, and what prevention was with skids.

Background technology

Known have that in vehicle parking, to make drive force source be that idling that driving engine stops stops control.In addition, it is also known for the vehicle (with reference to patent documentation 1) that vehicle also makes driving engine stop under steam.Through such control, can reduce the consumption of fuel of driving engine.

Patent documentation 1: (Japan) spy opens the 2006-170295 communique

Existing exploitation has following toric transmission, promptly, can and have the secondary speed-changing mechanism combination of step change level and enlarge the speed change zone the speed-changing mechanism that infinitely changes converter speed ratio.As stated, when the control of this toric transmission being carried out under steam shutting engine down (below be called " idle running stops "), following situation possibly take place.

Because of stopping of driving engine, when the rotation of the oil pump of the S. A. that is connected in driving engine also reduces, can reduce through main pressure that oil pump is supplied with.

The connection power of the band Clamping force of change-speed box and the friction coupling components of secondary speed-changing mechanism is compressed into row control through the master who is supplied with by oil pump.When this main pressure drop is low; Under the situation of the oil hydraulic circuit that is equipped with energy storage on the oil circuit of friction coupling components; And lead under the situation of the oil hydraulic circuit of pressing to the supply of friction coupling components in the fault of being interdicted owing to the "on" position of the electromagnet of the oil pressure that control friction coupling components takes place; The connection power of friction coupling components is higher than the band Clamping force, maybe be with such problem of skidding.

Summary of the invention

The present invention proposes in view of such problem points; Its purpose is to provide a kind of idle stop vehicle; It can make drive force source under steam is that driving engine stops, and prevents to be higher than the band Clamping force with the bad phenomenon of skidding etc. owing to the rub connection power of coupling components of stopping of driving engine.

According to an embodiment of the present invention, idle stop vehicle of the present invention makes drive force source stop in vehicle ', it is characterized in that possessing: oil pump, and its oil circuit that is rotated in through said drive force source produces main the pressure; Speed-changing mechanism, it can infinitely be changed converter speed ratio by the winding diameter of the band of belt wheel clamping through using said main pressure change; Secondary speed-changing mechanism, it is connected in series with respect to said speed-changing mechanism, and uses said main coupled situation of pressing a plurality of friction coupling components of change, can change the speed change level of level; The idle running shutdown feature; It is judged in vehicle ' when establishment and the said idle running stop condition of idle running stop condition have been set up; The idle running that execution stops the rotation of said drive force source stops, and said idle running shutdown feature possesses forbids the shutdown feature that dallies, and it is when judging that said idle running stop condition is set up; Be predicted as under the situation of connection power of said friction coupling components that band Clamping force that the execution that stops through idle running makes said belt wheel is lower than coupled situation, forbid that idle running stops.

According to the present invention; Stop condition is set up even vehicle dallies under steam; The band Clamping force of belt wheel is lower than under the situation of connection power of friction coupling components of coupled situation predicting the execution that stops through idle running; The stopping of rotation that also can forbid drive force source, therefore, the connection power that can the band Clamping force because of belt wheel be lower than the friction coupling components of coupled situation produces the bad phenomenon that band skids and prevents trouble before it happens.

Description of drawings

Fig. 1 is the summary pie graph of vehicle that is equipped with the toric transmission of first embodiment of the invention;

Fig. 2 be the expression first embodiment of the invention gearbox controller formation one the example instruction diagram;

Fig. 3 be the expression first embodiment of the invention speed change figure one the example instruction diagram;

Fig. 4 is the instruction diagram of the oil pressure control loop of first embodiment of the invention;

Fig. 5 is the instruction diagram of the state of the idle running of expression first embodiment of the invention speed-changing mechanism and the secondary speed-changing mechanism when stopping;

Fig. 6 is the instruction diagram of the state of the idle running of expression first embodiment of the invention speed-changing mechanism and the secondary speed-changing mechanism when stopping;

Fig. 7 is the instruction diagram of the state of the idle running of expression first embodiment of the invention speed-changing mechanism and the secondary speed-changing mechanism when stopping;

Fig. 8 is the diagram of circuit of the controller of first embodiment of the invention;

Fig. 9 is the instruction diagram of the oil pressure control loop of second embodiment of the invention;

Figure 10 is the instruction diagram of the main pressure and the relation that power-transfer clutch is pressed of expression second embodiment of the invention.

Nomenclature

1 driving engine

4 toric transmissions

The 10m mechanical oil pump

The 10e electric oil pump

11 oil pressure control loops

12 controllers

20 speed-changing mechanisms (stepless speed changing mechanism)

21 primary pulley

22 secondary pulley

23V type band

30 secondary speed-changing mechanisms

32 low brakes

33 high-speed clutches

The 34Rev drg

50 oil circuits

60 energy storages

70 hand valves

71 reducing valves

72 pressure regulating valves

The specific embodiment

(first embodiment)

Below, with reference to description of drawings embodiment of the present invention.In addition, in following explanation, the value that the input speed that " converter speed ratio " of certain speed-changing mechanism is meant this speed-changing mechanism obtains divided by the output speed of this speed-changing mechanism.In addition, " dead slow (Low) converter speed ratio " maximum converter speed ratio of being meant when converter speed ratio with this speed-changing mechanism is used for vehicle start etc." (High) converter speed ratio the most at a high speed " is meant the minimum converter speed ratio of this speed-changing mechanism.

Fig. 1 is the summary pie graph of the idle stop vehicle of embodiment of the present invention.This vehicle possesses driving engine 1 as drive source, the output of driving engine 1 rotation via the turbine transformer that ends power-transfer clutch with lock 2, first gear cluster 3, toric transmission (below, abbreviate " change-speed box 4 " as.), second gear cluster 5, terminal speed reduction gearing 6 transmit to drive wheel 7.Second gear cluster 5 be provided with when stopping can not mechanical rotation ground locking with the output shaft of change-speed box 4 stop mechanism 8.

Change-speed box 4 be provided with the rotation of input driving engine 1 and utilize the power of driving engine 1 a part and the mechanical oil pump 10m that drives, accept that electric power is supplied with and the electric oil pump 10e that drives from storage battery 13.Electric oil pump 10e is by the oil pump main body, be rotated drive electric motor and motor driver constitutes to it, can operating load is controlled to be arbitrarily load or control multistagely.In addition, in change-speed box 4, be provided with to from the oil pressure of mechanical oil pump 10m or electric oil pump 10e (below be called " the main PL of pressure ".) the oil pressure control loop 11 that carries out pressure regulation and supply with to each position of change-speed box 4.

Change-speed box 4 possess Belt-type Adjustable-speed mechanism (below be called " speed-changing mechanism 20 ".) and the secondary speed-changing mechanism 30 of connecting with speed-changing mechanism 20 and to be provided with." series connection is provided with " is meant the meaning that speed-changing mechanism 20 and secondary speed-changing mechanism 30 series connection is provided with from the power transfer path of driving engine 1 to drive wheel 7.Secondary speed-changing mechanism 30 as this example can with the output shaft direct connection of speed-changing mechanism 20, also can be via other speed change and even Poewr transmission mechanism (for example gear cluster) connection.Perhaps secondary speed-changing mechanism 30 also can be connected in the previous stage (input shaft side) of speed-changing mechanism 20.

Speed-changing mechanism 20 possesses primary pulley 21, secondary pulley 22, volume is hung on belt wheel 21, the V-type band 23 between 22.

Belt wheel

21,22 possesses respectively: fixedly the circular cone plate, with respect to this fixedly the circular cone plate make under the relative state of pulley face configuration and and fixedly form the movable circular cone plate of V-shaped groove, oil hydraulic cylinder 23a, the 23b that is located at the back side of this movable circular cone plate and makes the displacement axially of movable circular cone plate between the circular cone plate.When adjusting supplied to the oil pressure of oil

hydraulic cylinder

23a, 23b, the width of V-shaped groove changed, and V-type band 23 changes with the contact radius of each

belt wheel

21,22, and the converter speed ratio of speed-changing mechanism 20 infinitely changes.

Secondary speed-changing mechanism 30 for advance 2 grades/retreat 1 grade speed-changing mechanism.Secondary speed-changing mechanism 30 possesses: with the La Weilve type sun and planet gear 31 of two planetary planetary gear carriers bindings; Be connected with a plurality of turning units that constitute La Weilve type sun and planet gear 31, change a plurality of friction coupling components (low brake 32, high-speed clutch 33, Rev drg 34) of their coupled situation.When regulating when the supply oil pressure of each friction coupling components 32～34 and change respectively rub the connection of coupling components 32～34/release position, make the speed change level change of secondary speed-changing mechanism 30.

For example, if connect low brake 32, release high-speed clutch 33 and Rev drg 34, the speed change level of then secondary speed-changing mechanism 30 becomes 1 speed.If connect high-speed clutch 33, discharge low brake 32 and Rev drg 34, the speed change level of then secondary speed-changing mechanism 30 becomes converter speed ratio than 2 little speed of 1 speed.In addition, if connect Rev drg 34, release low brake 32 and high-speed clutch 33, the speed change level of then secondary speed-changing mechanism 30 becomes to be retreated.In following explanation, be to show as " change-speed box 4 is low-speed mode " under the situation of 1 speed in the speed change level of secondary speed-changing mechanism 30, under the situation that is 2 speed, show as " change-speed box 4 is fast mode ".

Each coupling components that rubs is located at the prime or the back level of speed-changing mechanism 20 on power transfer path, when connecting the transmission of power that then can carry out change-speed box 4, when discharging the transmission of power that then can not carry out change-speed box 4.

Controller 12 is the controller of Comprehensive Control driving engine 1 and change-speed box 4, and is as shown in Figure 2, memory storage 122, input interface 123, the output interface 124 that constitutes by CPU121, by RAM/ROM, their buses 125 connected to one another constituted.

The operational ton that detects Das Gaspedals in input interface 123 input be the accelerator open degree sensor 41 of accelerator open degree APO output signal, detect change-speed box 4 input speed (rotating speed of primary pulley 21 below is called " elementary rotational speed N pri ") tachogen 42 output signal, detect the car speed sensor 43 of speed of a motor vehicle VSP output signal, detect the main pressure sensor 44 of the main PL of pressure output signal, detect shifter bar the position cut-out switch 45 output signal, detect the output signal etc. of the drg hydraulic pressure transducer 46 of drg hydraulic pressure.

The various charts that store the variable speed control program of control program, the change-speed box 4 of driving engine 1, use by these programs at memory storage 122.CPU121 reads and carries out the program that is stored in memory storage 122; To the various calculation process of various signal in real time via input interface 123 inputs; Generate the drive signal of fuel injection amount signal, ignition timing signal, throttle opening signal, variable speed control signal, electric oil pump 10e, the signal that generates is exported to the motor driver of driving engine 1, oil pressure control loop 11, electric oil pump 10e via output interface 124.The various values that CPU121 uses in calculation process, its operation result suitably are stored in memory storage 122.

Oil pressure control loop 11 is made up of a plurality of streams, a plurality of pressure control valve.Oil pressure control loop 11 is based on a plurality of pressure control valves of variable speed control signal control that come self-controller 12; Switch the feed path of oil pressure; And, its each position to change-speed box 4 is supplied with according to the necessary oil pressure of oil pressure adjusting that produces by mechanical oil pump 10m or electric oil pump 10e.Thus, change the converter speed ratio of speed-changing mechanism 20, the speed change level of secondary speed-changing mechanism 30, carry out the speed change of change-speed box 4.

Fig. 3 representes to be stored in one of the speed change figure of memory storage 122 example.Controller 12 is controlled speed-changing mechanism 20, secondary speed-changing mechanism 30 based on this speed change figure and according to the operative condition (being speed V SP, elementary rotational speed N pri, secondary rotational speed N sec, throttle opening APO in the embodiment) of vehicle.

In this speed change figure, the operating point of change-speed box 4 is defined by speed V SP and elementary rotational speed N pri.Link change-speed box 4 operating point and the speed change figure lower left corner zero point line inclination and change-speed box 4 converter speed ratio (converter speed ratio of speed-changing mechanism 20 multiply by the converter speed ratio gained of secondary speed-changing mechanism 30 the single-piece converter speed ratio, below be called " running through converter speed ratio ".) corresponding.Among this speed change figure, identical with the speed change figure of existing variable v-belt drive, each throttle opening APO is set shift cable, the speed change of change-speed box 4 is carried out according to the shift cable of selecting according to throttle opening APO.In addition; For ease of explanation, only represent full load line (shift cable under the situation of throttle opening APO=4/8), local line's (shift cable under the situation of throttle opening APO=4/8), slide line (shift cable under the situation of throttle opening APO=0/8) among Fig. 3.

At change-speed box 4 is under the situation of low-speed mode, and change-speed box 4 can be made as the dead slow converter speed ratio at the converter speed ratio with speed-changing mechanism 20 and the low-speed mode dead slow line that obtains and the converter speed ratio of speed-changing mechanism 20 is made as high speed converter speed ratio and carries out speed change between the high-speed line of low-speed mode that obtains.Under this situation, the operating point of change-speed box 4 moves in a-quadrant and B zone.On the other hand; At change-speed box 4 is under the situation of fast mode, and change-speed box 4 can be made as the dead slow converter speed ratio at the converter speed ratio with speed-changing mechanism 20 and the fast mode dead slow line that obtains and the converter speed ratio of speed-changing mechanism 20 is made as high speed converter speed ratio and carries out speed change between the high-speed line of fast mode that obtains.Under this situation, the operating point of change-speed box 4 moves in B zone and C zone.

The converter speed ratio of each speed change level of secondary speed-changing mechanism 30 with the corresponding converter speed ratio of high-speed line of low-speed mode (low-speed mode high speed converter speed ratio) than setting with the little mode of the corresponding converter speed ratio of fast mode dead slow line (fast mode dead slow converter speed ratio).Thus; The scope that runs through converter speed ratio (being " fast mode ratio ranges " among the figure) part of scope that runs through converter speed ratio of the change-speed box of obtaining at low-speed mode 4 (being " low-speed mode ratio ranges " among the figure) and the change-speed box 4 obtained at fast mode repeats; Be at the operating point of change-speed box 4 under the situation in the B zone of high-speed line clamping by fast mode dead slow line and low-speed mode, change-speed box 4 also can be selected arbitrary pattern in low-speed mode, the fast mode.

In addition, on this speed change figure, with the high-speed line of low-speed mode on the mode that overlaps be set with the mode switch shift cable of carrying out secondary speed-changing mechanism 30 speed changes.With the mode switch shift cable corresponding run through converter speed ratio (below be called " mode switch speed ratio mRatio ".) be set to the value that equates with the high speed converter speed ratio of low-speed mode.It is that the more little then input torque to secondary speed-changing mechanism 30 of converter speed ratio in order to suppress speed-changing mechanism 20 is more little that the mode switch shift cable is set like this, and the speed change when making secondary speed-changing mechanism 30 speed changes is impacted.

And; Stride across under the situation that mode switch speed ratio mRatio changes in the actual value (below be called " the actual converter speed ratio Ratio that runs through ") that under the situation of the operating point crosscut mode switch shift cable of change-speed box 4, promptly runs through converter speed ratio; Controller 12 carries out the coordination speed change of following explanation, carries out the switching between fast mode-low-speed mode.

In coordinating speed change, controller 12 carries out the speed change of secondary speed-changing mechanism 30, and, the converter speed ratio of speed-changing mechanism 20 is changed to the direction in the opposite direction that the converter speed ratio with secondary speed-changing mechanism 30 changes.At this moment, during making that the converter speed ratio of inertia phase and speed-changing mechanism 20 of the converter speed ratio actual change of secondary speed-changing mechanism 30 changes synchronously.It is in order to make the actual converter speed ratio Ratio that runs through go up the variation that the differential input rotation that brings takes place and can not bring human discomfort to the runner that the converter speed ratio that makes speed-changing mechanism 20 changes to the converter speed ratio with secondary speed-changing mechanism 30 that opposite direction changes.

Particularly; Change-speed box 4 actual run through converter speed ratio Ratio stride across mode switch speed ratio mRatio from low speed side under the situation that high-speed side changes; Controller 12 changes to 2 speed (1-2 speed change) with the speed change level of secondary speed-changing mechanism 30 from 1 speed, and the converter speed ratio with speed-changing mechanism 20 changes to low speed side simultaneously.

On the contrary; Change-speed box 4 actual run through converter speed ratio Ratio stride across mode switch speed ratio mRatio from high-speed side under the situation that low speed side changes; Controller 12 changes to 1 speed (2-1 speed change) with the speed change level of secondary speed-changing mechanism 30 from 2 speed, and the converter speed ratio with speed-changing mechanism 20 changes to high-speed side simultaneously.

In addition, the idle running explained as follows in order to suppress fuel discharge of controller 12 stops control.

Idle running stops to be controlled to be the control that makes driving engine 1 stop (idle running stops) automatically when vehicle goes in low speed of a motor vehicle territory and suppress fuel discharge.The fuel of carrying out when throttle is closed is common by being controlled at that fuel feeding to driving engine 1 stops on this point; But, make the rotation of driving engine 1 stop that fully difference is arranged on this point discharging lock-up clutch and friction coupling components (low brake 32 or high-speed clutch 33) and breaking off the power transfer path between driving engine 1 and the drive wheel 7.

When execution idle running stopped to control, controller 12 was at first judged condition a～d for example as follows.

A: pin leaves Das Gaspedal (throttle opening APO=0)

B: step on down brake pedal (brake fluid pressure is more than the specified value)

C: the speed of a motor vehicle be below the fixed low speed of a motor vehicle (for example 15km/h)

D: discharge lock-up clutch.

In other words, these conditions are to be used to judge whether the driver has the condition of the intention of stopping.

Lock-up clutch is removed line (not shown) at the locking that will be set in speed change figure and is released under the situation of low speed side or low rotation side crosscut from high-speed side or high rotation side.Controller 12 is judged as the idle running stop condition and sets up under the situation that these conditions a～d all sets up.

When idle running stops, stopping fuel feeding, driving engine 1 is stopped automatically to driving engine 1.When driving engine 1 stops, also stopping by the power operated mechanical oil pump 10m of driving engine 1, it is discharged to press and becomes zero, and low brake 32 is discharged fully.Low brake 32 is released when roughly stopping with driving engine and mechanical oil pump 10m.

When from mechanical oil pump 10m to the oil hydraulic cylinder 23a of

belt wheel

21,22, the supply oil pressure vanishing of 23b; And low brake 32 is released; When speed-changing mechanism 20 was free at hand of rotation, the converter speed ratio of speed-changing mechanism 20 changed to the dead slow converter speed ratio through the retracing spring that is disposed in oil hydraulic cylinder 23a, the 23b.

When mechanical oil pump 10m stopped, the driving of electric oil pump 10e began, and the oil pressure that produces at electric oil pump 10e supplies to oil

hydraulic cylinder

23a, 23b, makes speed-changing mechanism 20 be changed to the dead slow converter speed ratio.

The oil pressure that supplies to oil

hydraulic cylinder

23a, 23b is merely the oil pressure by

belt wheel

21,22 clamping bands 23, for transferring power, is not sufficient oil pressure.But because low brake 32 is released, secondary speed-changing mechanism 30 be the neutral state, so if braking etc. from drive wheel 7 input torques, this torque also can not prevent the slip with 23 via secondary speed-changing mechanism 30 to speed-changing mechanism 20 transmission.

In addition; Controller 12 is after low brake 32 is released; The input side parts and the gap between the outgoing side parts that make supply oil pressure to low brake 32 rise to low brake 32 are zero; And the torque capacity of low brake 32 (can torque transmitted) is zero oil pressure (below, be called " oil pressure at zero point ").This is because in idle running stops, and will connect state before at once through low brake 32 is maintained, thereby the torque capacity of low brake 32 is risen rapidly, improves acceleration responsiveness again.

The judgement whether condition of in addition, proceeding above-mentioned a～d is also set up in idle running stops.And when one of them condition was false, the idle running stop condition just became and is false, and controller 12 is opened the fuel feeding to driving engine 1 once more, restarts driving engine 1, and in the moment that mechanical oil pump 10m produces sufficient oil pressure electric oil pump 10e was stopped.

Fig. 4 is the instruction diagram of formation of the oil pressure control loop 11 of this embodiment of expression.

Oil pressure control loop 11 possesses the mechanical oil pump 10m through the drive force of driving engine 1.The oil pressure that mechanical oil pump 10m produces is adjusted to the main of regulation through pressure regulator valve 51 and presses, and distributes to the each several part of speed-changing mechanism 20 and secondary speed-changing mechanism 30 via oil circuit 50.

In addition, the oil pressure of mechanical oil pump 10m generation supplies to turbine transformer 2 via pressure regulator valve 51.This oil pressure is used for the transmission of torque of turbine transformer 2 and connection, the release of lock-up clutch.

The grease chamber that the master of oil circuit 50 is pressed to the oil hydraulic cylinder 23b of secondary pulley 22 supplies with.In addition, the main pressure of oil circuit 50 is depressurized through reducing valve 52, supplies with to the grease chamber of the oil hydraulic cylinder 23a of primary pulley 21 then.Regulate the oil pressure of the grease chamber that supplies to oil hydraulic cylinder 23a through reducing valve 52; Thus, utilize and supply to the main pressure reduction of pressing of the grease chamber of oil hydraulic cylinder 23b, the width of V-shaped groove separately changes; Take place with the contact radius of belt wheel with 23, the converter speed ratio of speed-changing mechanism 20 infinitely changes.

In addition, in secondary speed-changing mechanism 30, the main pressure via reducing valve 53 of oil circuit 50 supplied with to low brake 32, supplies with to high-speed clutch 33 via reducing valve 54.Reducing valve 53 is regulated the oil pressure that supplies to low brake 32, the connection power of control low brake 32.Reducing valve 54 is regulated the oil pressure that supplies to high-speed clutch 33, the connection power of control high-speed clutch 33.

Oil circuit 56 between reducing valve 53 and low brake 32 is connected with energy storage 60.Energy storage 60 stores power fluid in inside, relaxes the variation of the oil pressure of oil circuit 56 through this power fluid.

Particularly, when oil pressure is under the situation more than the authorized pressure, the inside of energy storage 60 stores power fluid.Be lower than when oil pressure under the situation of authorized pressure, store at the power fluid of energy storage 60 and supply with, make the operating lag of the oil pressure reduction of oil circuit 56 to oil circuit 56.In addition, under the situation that the oil pressure of oil circuit 56 rises from low state, power fluid stores in energy storage 60, the operating lag that the oil pressure of oil circuit 56 is risen.Thus, the oil pressure responsibility of oil pressure 56 is postponed, suppress rapid rising, the reduction of oil pressure, therefore, can suppress connection, the impact when discharging of low brake 32.

Controller 12 control pressure regulator valves 51 are regulated main the pressure.In addition, control reducing valve 52 is regulated the oil pressure to the oil hydraulic cylinder 23a of primary pulley 21, the converter speed ratio of control speed-changing mechanism 20.In addition, control reducing valve 53, the coupled situation of control low brake 32.In addition, control reducing valve 54, the coupled situation of control high-speed clutch 33.

Mechanical oil pump 10m drives through the rotation of driving engine 1.During driving engine 1 rotation, mechanical oil pump 10m rotates always, produces the needed oil pressure of change-speed box 4 work.Even change-speed box 4 starting owing to vehicle under the vehicle halted state also needs oil pressure, therefore, under the state that driving engine 1 rotates when vehicle stops, through driving and generating master's pressure of mechanical oil pump 10m.

On the other hand, stop to wait through idle running making under the situation that driving engine 1 stops the rotation, the driving of mechanical oil pump 10m stops, and oil pressure reduces.Thus, oil circuit 50 possesses electric oil pump 10e.

For the rotation at driving engine 1 stops, when not working, mechanical oil pump 10m supplies with oil pressure to change-speed box 4, and electric oil pump 10e is through the control of controller 12, is used to drive from the supply of the electric power of storage battery 13, thereby produces oil pressure.

In addition, electric oil pump 10e is the oil pump that stops or dallying and work when the comparison underload such as stopping in idling.Therefore, preferably have the capacity of the level that can satisfy the needed oil pressure under this operational situation, and can not increase and the capacity of the level that cost can not rise for the weight of vehicle.

Below, the action the when idle running of controller 12 control is stopped to describe.

Fig. 5 is the instruction diagram of the state of the idle running of this embodiment of expression speed-changing mechanism 20 and the secondary speed-changing mechanism 30 when stopping.

As stated, under the situation that the idle running stop condition is set up, controller 12 stops driving engine 1, carries out idle running and stops.

When execution idle running stopped, the rotating speed of driving engine 1 reduced gradually, and thereafter, rotating speed becomes zero.Thus, the rotating speed of the mechanical oil pump 10m that is driven by driving engine 1 also reduces gradually, and the oil pressure that mechanical oil pump 10m produces also reduces gradually.In addition, in this case, the oil pressure of supplying with to oil circuit 50 from mechanical oil pump 10m can not reduce at once, therefore can temporarily guarantee needed main pressure of clamping of V-type band 23 of connection or speed-changing mechanism 20 of the friction coupling components of change-speed box 4.

Controller 12 is carried out idle running and is stopped, and makes electric oil pump 10e work simultaneously.Thus, electric oil pump 10e substitutes the main pressure that mechanical oil pump 10m produces oil pressure control loop 11.In the change-speed box 4, the main pressure to initially compressing into row control that produces with electric oil pump 10e pressed in the connection of the connection pressure of the friction coupling components of secondary speed-changing mechanism 30 or the V-type band 23 of speed-changing mechanism 20.Friction coupling components in the connection discharges through this main Be Controlled of pressing.

In addition, stop through idle running, before the rotation of driving engine 1 stopped, because the compression reaction force of cylinder, driving engine 1 rotated to reversing sense sometimes.Thus, the direct mechanical oil pump 10m that is rotated that links rotates to reversing sense with the S. A. of driving engine 1, is discharging the negative oil pressure of side generation, and the master presses temporary transient transition to be reduced near zero.Thereafter, after the rotation of driving engine 1 stopped fully, the oil pressure that utilizes electric oil pump 10e to produce was supplied with as main the pressure.In addition, might not mean driving engine 1 retrograde rotation when idle running stops.

In speed-changing mechanism 20 and the secondary speed-changing mechanism 30, the connection power of the Clamping force of the V-type band 23 of each belt wheel and friction coupling components keeps through main the pressure, but these power reduce along with main reduction of pressing.In addition, in this embodiment, the power of primary pulley 21 and secondary pulley 22 clamping V-shaped bands is called the band Clamping force (representing) of belt wheel with long and short dash line.In addition, in the secondary speed-changing mechanism 30, the power in the generation of friction coupling components that will produce the friction coupling components in connecting now (low brake 32 or high-speed clutch 33) supply oil pressure is called the connection power (dotting) of power-transfer clutch.

Usually, when secondary speed-changing mechanism 30 speed changes, on one side the friction coupling components skid, Yi Bian connect/discharge.On the other hand, when the V-type band 23 of the speed-changing mechanism 20 in the rotation skidded, the pulley face of primary pulley 21 or secondary pulley 22 might damage, and perhaps breakage of pulley face or V-type band 23 self breakage take place, and therefore, require V-type band 23 not skid.

Stop through carrying out idle running, main pressure drop is low, and the band Clamping force of belt wheel and the connection power of power-transfer clutch reduce.At this moment, before execution idle running stopped, the band Clamping force of belt wheel was higher than the connection power of power-transfer clutch; Therefore; After execution idle running stops, Yi Bian keep the state that the band Clamping force of belt wheel is higher than the connection power of power-transfer clutch, Yi Bian the Clamping force of belt wheel and the connection power of power-transfer clutch are reduced.Therefore, the friction coupling components at first is released, can input speed-change mechanism 20 from the propulsive effort of driven wheel side, and therefore, V-type band 23 can not skid.

Fig. 6 is the instruction diagram of an example of the state of the idle running of this embodiment of expression speed-changing mechanism 20 and the secondary speed-changing mechanism 30 when stopping.

Among Fig. 5, as stated, carry out idle running and stop, the rotating speed of driving engine 1 reduces, and thus, the discharge pressure drop of mechanical oil pump 10m is low, and main the pressure also reduced.Thus, the connection power of the band Clamping force of belt wheel and power-transfer clutch reduces respectively.

When execution idle running stopped, controller 12 made the release of the low brake 32 in the connection.At this moment, in the oil circuit 56 of low brake 32 being supplied with oil pressure, possess energy storage 60, therefore,, the responsibility of the reduction of the oil pressure of supplying with low brake 32 is postponed through accumulating in the oil pressure of energy storage 60.

Therefore, the reduction of the band Clamping force of belt wheel is faster than the reduction of the connection power of power-transfer clutch, and the Clamping force of V-type band 23 is lower than the connection power of low brake 32, and V-type band 23 might skid.

Fig. 7 is other routine instruction diagram of the state of the idle running of this embodiment of expression speed-changing mechanism 20 and the secondary speed-changing mechanism 30 when stopping.

Among Fig. 5, as stated, carry out idle running and stop, because the reduction of the rotating speed of driving engine 1, thereby the discharge pressure drop of mechanical oil pump 10m is low, and main the pressure also reduced.Thus, the connection power of the band Clamping force of belt wheel and power-transfer clutch reduces respectively.

At this, because speed-changing mechanism 20 and secondary speed-changing mechanism 30 characteristic separately, the connection power of the power-transfer clutch of certain friction coupling components (for example, low brake 32) is higher than the band Clamping force of belt wheel sometimes.In this case, when common running, through controller 12 Sustainable Control oil pressure, so that the band Clamping force of belt wheel is higher than the connection power of power-transfer clutch.

On the other hand, when when this friction coupling components is connected, carrying out under the situation about stopping that dallying, because main pressure drop is low, thereby the control surplus of controller 12 reduces.Under this situation, when the master presses less than certain specified value, become the zone below the boundary of skidding (dotting); At this moment; Because the connection power of power-transfer clutch is higher than the band Clamping force of belt wheel, so the Clamping force of V-type band 23 is lower than the connection power of this friction coupling components, V-type band 23 might skid.

Like this, be positioned under the situation of coupled situation at certain friction coupling components (for example, low brake 32); Carrying out idle running stops; Because the rotating speed of driving engine 1 reduces, thereby because the discharge pressure drop of mechanical oil pump 10m is low, main pressure drop is low; So the band Clamping force of belt wheel is lower than the connection power of power-transfer clutch, V-type band 23 might skid.

So, in this embodiment, in order to prevent to skid, so controller 12 is carried out following control owing to V-type band 23 takes place such situation.

Fig. 8 is the controller 12 of this embodiment diagram of circuit that the execution that stops judges that dallies.In addition, the processing of this diagram of circuit (for example, 10ms) is carried out with predetermined distance at controller 12.

Controller 12 judges according to the operative condition of existing vehicle whether the idle running stop condition sets up (step S101).

So-called idle running stop condition, as stated, for example, for pin leaves, steps on down brake pedal, the speed of a motor vehicle for below the low speed of a motor vehicle of stipulating and the d/d situation of lock-up clutch from Das Gaspedal.

Be judged to be under the invalid situation of idle running stop condition, the processing of process ends is not carried out idle running and is stopped.

Be judged to be under the situation that the idle running stop condition sets up, controller 12 judges that whether the state of present speed-changing mechanism 20 and secondary speed-changing mechanism 30 is to be predicted as the state (step S102) that band Clamping force that the execution that stops through idle running makes belt wheel is lower than the connection power of power-transfer clutch.

More particularly, among Fig. 6, as stated; In oil circuit 56 from oil pressure to the friction coupling components that supply with, possess under the situation of energy storage 60; Before idle running stopped to carry out, this friction coupling components (for example, low brake 32) was a coupled situation; Because the execution that stops of idle running need be carried out under the situation of release of this friction coupling components, be judged to be the state that band Clamping force that the execution that stops through idle running makes belt wheel is lower than the connection power of power-transfer clutch that is predicted as.

In addition, among Fig. 7, as stated; The connection power of the power-transfer clutch of friction coupling components is higher than the band Clamping force of belt wheel; Before idle running stopped to carry out, this friction coupling components (for example, low brake 32) was a coupled situation; Because the execution that stops of idle running need be carried out under the situation of release of this friction coupling components, be judged to be and be predicted as the execution that stops through idle running and in the zone of skidding below the boundary, make the band Clamping force of belt wheel be lower than the state of the connection power of power-transfer clutch.

Like this; Being judged to be certain specific friction coupling components (for example, low brake 32) at controller 12 is coupled situation, secondary speed-changing mechanism 30 for the speed change level that realizes of connection through its friction coupling components (for example; 1 speed) under the situation; Be predicted as the connection power that Clamping force that the execution that stops through idle running makes belt wheel is lower than power-transfer clutch, whether the stop condition that no matter dallies is set up, and all is judged to be not carrying out idle running and stop.

In step S102, controller 12 is not carried out under the idle running situation about stopping being judged to be, and the processing of process ends not being carried out idle running and stopping.That is, formation is forbidden the shutdown feature that dallies.

On the other hand, not to be predicted as under the situation of state of the connection power that idle running stops through carrying out, the band Clamping force of belt wheel is lower than power-transfer clutch (for example, high-speed clutch 33 be 2 speed of coupled situation), controller 12 is carried out to dally and is stopped (step S103).That is, constitute the idle running shutdown feature.

Consequently, secondary speed-changing mechanism 30 for certain the friction coupling components (for example, low brake 32) be coupled situation the speed change level (for example; 1 speed) under the situation; Whether the condition no matter idle running stops to be set up, and for skidding of the V-type band 23 that prevents speed-changing mechanism 20, all not carrying out idle running and stopping.

At this, the band Clamping force of the belt wheel that uses in the first embodiment of the invention is meant the band Clamping force of secondary pulley 22.This is because with respect to the compression area of the oil hydraulic cylinder 23a of primary pulley 21; The compression area of the oil hydraulic cylinder 23b of secondary pulley 22 is set for a short time; Therefore; When two belt wheels are supplied with identical oil pressure, the Clamping force of secondary pulley 22 is skidded in secondary pulley 22 less than the Clamping force of primary pulley 21.Therefore, if the connection power of power-transfer clutch is lower than the band Clamping force of secondary pulley 22, then primary pulley 21 and secondary pulley 22 are not skidded.In addition, at the compression area with respect to the oil hydraulic cylinder 23a of primary pulley 21, set under the big situation of the compression area of oil hydraulic cylinder 23b of secondary pulley 22, the band Clamping force of belt wheel is the band Clamping force of primary pulley 21.

As above; First embodiment of the invention is following idle stop vehicle, has the toric transmission that is constituted and can be enlarged the speed change zone by stepless speed changing mechanism (speed-changing mechanism) 20 and the secondary speed-changing mechanism with a plurality of speed change levels 30, stops to carry out under steam stopping of driving engine through idle running; Thus; Can subdue the fuel of driving engine 1, enlarged area can reduce specific consumption of fuel.

And, in the judgement that stops of dallying whether, because the reduction of driving engine 1 rotation; The rotation of mechanical oil pump 10m reduces; Main pressure drop is low, thus, the band Clamping force that is estimated as belt wheel be lower than in the connection the friction coupling components (for example; Under the situation of the connection power of power-transfer clutch low brake 32), not dallying stops.Thus, can preventing trouble before it happens with the bad phenomenon such as breakage of the breakage of the pulley face that causes primary pulley 21 or secondary pulley 22 owing to skidding of V-type band 23 or V-type band 23 self.This effect and the present invention first, the 5th aspect are corresponding.

In addition, carry out idle running and stop, and make in the connection the friction coupling components (for example; Low brake 32) becomes release position; Thus, the connection power of the friction coupling components in the connection is reduced, the connection power of the coupling components that can suppress to rub is higher than the band Clamping force of belt wheel.This effect is corresponding with second aspect present invention.

In addition; As the condition that does not dally and stop, with the purpose of the impact that relax to connect, discharge, the friction coupling components that in oil circuit 56, possesses energy storage 60 (for example; Low brake 32) is coupled situation; Through this friction coupling components is coupled situation, makes under the situation of secondary speed-changing mechanism 30 for the speed change level (1 speed) of regulation, does not carry out idle running and stops.Thus, can realize preventing V-type band 23 skid and when carrying out idle running and stopping (2 speed when high-speed clutch 33 connects) reduce consumption of fuel the two.This effect is corresponding with third aspect present invention.

(second embodiment)

Then, second embodiment of the present invention is described.In second embodiment, the formation of oil pressure control loop 11 is different with first embodiment.In addition, (Fig. 1～Fig. 3) identical with first embodiment omits its explanation to the basic comprising of second embodiment.

Fig. 9 is the instruction diagram of formation of the oil pressure control loop 11 of expression second embodiment of the invention.

Oil pressure control loop 11 possesses the mechanical oil pump 10m through the drive force of driving engine 1.The oil pressure that mechanical oil pump 10m produces is adjusted to the main of regulation through pressure regulator valve 51 and presses, and distributes to each one of speed-changing mechanism 20 and secondary speed-changing mechanism 30 again via oil circuit 50.

Speed-changing mechanism 20 is identical with the first above-mentioned embodiment, and main grease chamber of pressing to the oil hydraulic cylinder 23b of secondary pulley 22 supplies with.In addition, the main of oil circuit 50 pressed through reducing valve 52 decompressions, supplies with to the grease chamber of the oil hydraulic cylinder 23a of primary pulley 21.

In addition, in the secondary speed-changing mechanism 30, oil circuit 50 main pressures are distributed to high-speed clutch 33 and low brake 32 via hand valve 70.Hand valve 70 changes with shifter bar, the master is pressed to low brake 32 and high-speed clutch 33 is supplied with at activation point, in neutral gear or the main supply of pressing of stop position restriction, power-transfer clutch is discharged.

Main the pressure again via behind the hand valve 70 supplied with to high-speed clutch 33 via reducing valve 54.In addition, the main pressure via pressure regulating valve 72 supplied with to low brake 32.

Pressure regulating valve 72 is supplied with the main pressure of coming through utilizing oil pressure after pressure regulating valve 71 pressure regulation to regulate institute, exports to low brake 32.

Pressure regulating valve 72 through spring 72a with valve rod 72b to a direction application of force.Under this state, the oil circuit 56 of the oil circuit of oil circuit 50 sides and low brake 32 sides is communicated with, and main straightening connects to low brake 32 outputs.

In addition, at the oil pressure of pressure regulating valve 72 inputs after reducing valve 71 pressure regulation.The elastic force of this oil pressure antagonism spring 72a, the action of pushing valve rod 72b.Reducing valve 71 has electromagnet, controls the oil pressure of reducing valve 71 outputs through the load of controller 12.With this oil pressure input pressure regulating valve 72, thus, valve rod 72b is moved to the top, the valve opening of change pressure regulating valve 72 thus, can be controlled the oil pressure that supplies to low brake 32.

In the first above-mentioned embodiment, supply to the oil pressure of low brake 32 through reducing valve 53 controls.In addition, supply to the oil pressure of high-speed clutch 33 through reducing valve 54 controls.These reducing valves have electromagnet, control the oil pressure of output through the load of this controller 12.

But, controlling under the situation of electromagnet through electric power like this, owing to reasons such as interference or bad contacts, the "on" position that electromagnet takes place sometimes is disconnected such fault.Under the situation that such fault takes place, electromagnet can not carry out oil pressure control, on the friction coupling components, does not produce to connect oil pressure and can not connect.Under this situation, can not the propulsive effort from driving engine 1 be passed to drive wheel, vehicle might be able to not go.

In this embodiment; As stated; In order to prevent to cause vehicle not go because of the fault of electromagnet; The friction coupling components is maintained the fail safe of coupled situation, the oil pressure through electromagnet direct control friction coupling components, but possess through the pressure regulating valve 72 by the aperture of the valve of the oil pressure control physics of magnet control in low brake 32 sides.

The electromagnet of reducing valve 71 of oil pressure that supply is used to control the aperture of this pressure regulating valve 72 is a closed type, and it constitutes, and when current signal was closed, oil pressure became zero, and when current signal was maxim, oil pressure was maximum.

At this, be disconnected and under the situation of et out of order, the oil pressure of the reducing valve 71 of closed type becomes zero in the "on" position of reducing valve 71.Thus, pressure regulating valve 72 is through the elastic force of

spring

72a, and 72b pushes downwards with valve rod, and the oil circuit 56 of the oil circuit of oil circuit 50 sides and low brake 32 sides becomes connected state.Thus, the main pressure always supplied with to low brake 32, makes low brake 32 become coupled situation.

Therefore,, can not control under the situation of oil pressure, also can supply with main the pressure, make low brake 32 become coupled situation low brake 32 at reducing valve 71 et out of orders by current control, can be with the propulsive effort minimum ground of driving engine 1 to the drive wheel transmission.

Like this, constitute: through pressure regulating valve 72 and reducing valve 71, be the output oil pressure of reducing valve 71 with respect to the oil hydraulic circuit of reverse characteristic, the control oil pressure of the low brake 32 that pressure regulating valve 72 is regulated becomes reverse, thus, realizes fail safe.

In the oil pressure control loop 11 of this embodiment that constitutes like this, carrying out under the situation about stopping that dallying, following problem possibly take place.

Figure 10 is the main instruction diagram of pressing the relation of the oil pressure of exporting with pressure regulating valve 72 (power-transfer clutch pressure) of the oil pressure control loop 11 of expression second embodiment.

In addition, at this, pressure regulating valve 72 is called " power-transfer clutch pressure " to the oil pressure of low brake 32 outputs.

In the pressure regulating valve 72, power-transfer clutch is pressed with main the pressure as initial and is pressed, and controls through reducing valve 71.The power-transfer clutch of pressure regulating valve 72 outputs is pressed with respect to main the pressure and is reverse characteristic.If main the pressure to more than the specified value then can be with voltage-controlled 0 (MPa) that be made as of power-transfer clutch, but is being lower than under the situation of specified value, the lower limit of pressing through the power-transfer clutch of main pressure-controlled rises along the characteristic line among the figure.In addition, at this, press controlled 0 the main specified value of pressing of being made as to be called " A point " power-transfer clutch.

If main the pressure is higher than the A point, then pressure regulating valve 72 can with the power-transfer clutch pressure-controlled from 0 press to power-transfer clutch with main the pressure be 1: 1 the line (1: 1 line of main pressure/power-transfer clutch pressure).

At this, as stated, to carry out idle running and stop, the rotating speed of driving engine 1 reduces, and thus, the discharge pressure drop of mechanical oil pump 10m is low, and main the pressure also reduced.Thereafter, main pressure drop is low equates to the oil pressure with electric oil pump 10e output.

At this moment, in the first embodiment, as stated, if the band Clamping force of the belt wheel of speed-changing mechanism 20 is not higher than the connection power of the power-transfer clutch of the friction coupling components (at this, being low brake 32) in the connection of secondary speed-changing mechanism 30, then V-type band 23 skids.

Press because directly input is main in the oil hydraulic cylinder 23b of secondary pulley 22, therefore, the band Clamping force of belt wheel be with master's pressure about equally or than its little some value.

On the other hand, press by the power-transfer clutch of pressure regulating valve 72 outputs to low brake 32 inputs, but because the band Clamping force of belt wheel is higher than the connection power of power-transfer clutch, therefore, need be with the voltage-controlled side of pressing that is made as of power-transfer clutch less than main.In Figure 10, because the band Clamping force of belt wheel is higher than the connection power of power-transfer clutch, therefore, must be with the zone of power-transfer clutch pressure-controlled dashdotted downside in the drawings.

But, when main pressure drop hangs down to certain pressure, can not overcome the elastic force of the spring 72a of pressure regulating valve 72, can not push valve rod 72b, oil circuit 50 is communicated with the oil circuit of low brake 32 sides, and the main state that is transfused to as the direct clutch pressure of pressing takes place.

Among Figure 10, the oil pressure that impassabitity master pressure moves the valve rod 72b of pressure regulating valve 72 is represented as the B point.Force down under the situation that B is ordered main, the main pressure with the power-transfer clutch pressure equates that power-transfer clutch presses the connection power of the power-transfer clutch that causes to be higher than the band Clamping force of belt wheel.Under this situation, V-type band 23 might skid.

So; In this embodiment; Secondary speed-changing mechanism 30 is the speed change level (for example, 1 speed) of coupled situation for the friction coupling components (for example, low brake 32) of regulating the power-transfer clutch pressure through the pressure regulating valve 72 that becomes reverse characteristic; Need be, be controlled to be that not carrying out dallies stops through carrying out under the situation of release that idle running stop to carry out this friction coupling components.

Specifically; In the step S102 of Fig. 8 of first embodiment; Be judged to be following state; The friction coupling components that pressure regulating valve 72 control clutchs through becoming reverse characteristic are pressed is a coupled situation, need be predicted as the execution that stops through the line space commentaries on classics and make the band Clamping force of belt wheel be lower than the connection power of power-transfer clutch through carrying out under the situation of release that idle running stop to carry out this friction coupling components.

For being predicted as under the situation of state of connection power that band Clamping force that the execution that stops through idle running makes belt wheel is lower than power-transfer clutch, the processing that controller 12 process ends are carried out not being carried out idle running and stopping.

Through control like this,, not carrying out idle running and stopping for skidding of the V-type band 23 that prevents speed-changing mechanism 20.Thus, can the breakage of the breakage of the pulley face that causes primary pulley 21 or secondary pulley 22 owing to skidding of V-type band 23 or V-type band 23 self be prevented trouble before it happens.

At this, based on the reason identical with first embodiment, the band Clamping force of the employed belt wheel of second embodiment of the invention also is the band Clamping force of secondary pulley 22.

As stated, second embodiment of the present invention provides following idle stop vehicle, has the toric transmission that is constituted and can be enlarged the speed change zone by stepless speed changing mechanism (change-speed box) 20 and the secondary speed-changing mechanism with a plurality of speed change levels 30; Wherein, Stop and carrying out stopping of driving engine under steam through idle running, thus, can subdue the fuel of driving engine 1; Enlarged area can reduce consumption of fuel.

And, identical with first embodiment, be lower than under the situation of connection power of power-transfer clutch of the friction coupling components (for example, low brake 32) in the connection in the band Clamping force of the belt wheel that is estimated as V-type band 23, not dallying stops control.

More particularly; As the condition that does not dally and stop; The control of connection power of friction coupling components is controlled as follows, promptly, through the pressure regulating valve 72 of control valve opening by the control pressure after reducing valve 71 (corresponding with the electromagnetic valve of the fourth aspect present invention) pressure regulation, regulates main the pressure; The friction coupling components (low brake 32) of control coupled situation is a coupled situation; Because this friction coupling components is a coupled situation, thereby under the situation of secondary speed-changing mechanism 30 for the speed change level (1 speed) of regulation, does not carry out idle running and stop.Thus, can realize preventing V-type band 23 skid and when carrying out idle running and stopping (2 speed when high-speed clutch 33 connects) the reduction consumption of fuel the two.This effect is corresponding with fourth aspect present invention.

More than, embodiment of the present invention is illustrated, but above-mentioned embodiment has only been represented one of application examples of the present invention, be not the concrete formation that technical scope of the present invention is defined in above-mentioned embodiment.

In addition, constituting of above-mentioned embodiment possesses electric oil pump 10e, and the master that can guarantee to dally when stopping to press, and is decided to be the formation that possesses electric oil pump 10e but differ.Even do not possess electric oil pump 10e; Stop through idle running, the work of mechanical oil pump 10m is stopped, even stop to the oil pressure supply of friction coupling components or belt wheel; The oil pressure of being supplied with by mechanical oil pump 10m can not reduce immediately yet; Therefore, at the specified time that stops to begin apart from driving engine 1, the connection power of the coupling components of can guaranteeing to rub and be used to the main of Clamping force press.Therefore,, driving engine is stopped, can reducing consumption of fuel from apart from being before the specified time in moment of zero than the speed of a motor vehicle.

In addition, in the formation that possesses electric oil pump 10e, as stated; Even after mechanical oil pump 10m stops, still producing oil pressure, the connection power of the coupling components of can guaranteeing to rub and be used to the main of Clamping force press; Therefore; Stop and further prolonging the time that driving engine 1 is stopped through idle running, compare, can further reduce consumption of fuel with the formation that does not possess electric oil pump 10e.

In addition, in the above-described embodiment, possess Belt-type Adjustable-speed mechanism, replace V-type band 23 volumes to be hung on belt wheel 21, the stepless speed changing mechanism between 22 but speed-changing mechanism 20 also can be a chain as speed-changing mechanism 20.Perhaps, speed-changing mechanism 20 also can be the ring type stepless speed changing mechanism of the live roll that configuration can be verted between input disc and output panel.

In addition, in the above-described embodiment, the back level of speed-changing mechanism 20 possesses secondary speed-changing mechanism 30, but also can be that prime at speed-changing mechanism 20 is the formation that possesses secondary speed-changing mechanism 30 between turbine transformer 2 and the speed-changing mechanism 20.

In addition, in the above-described embodiment, secondary speed-changing mechanism 30 has the two-stage speed-changing mechanism of 1 speed and 2 speed for the speed change level as the usefulness of advancing, but also can be for secondary speed-changing mechanism 30 is had the speed-changing mechanism of the speed change level more than 3 grades as the speed change level of the usefulness of advancing.The speed change level of secondary speed-changing mechanism 30 is under the situation more than 3 grades; Also can control as follows; Promptly, the band Clamping force that is assumed to the friction coupling components belt wheel when the main pressure drop that stops along with idle running is low that is used to realize a speed change level is lower than under the situation of connection power of power-transfer clutch, the idle running of not carrying out this speed change level stops.

In addition; In second embodiment, utilize the pressure regulating valve 72 of reverse characteristic, as the fail safe of low brake 32; But may not be low brake 32, also can be made as the fail safe of such pressure regulating valve 72 in the friction coupling components in the friction coupling components of secondary speed-changing mechanism 30.For example, high-speed clutch 33 possesses electromagnet by the pressure regulating valve of the forward characteristic of the oil pressure of NORM OPN reducing valve control, thus, also can be used as fail safe.

In addition, secondary speed-changing mechanism 30 uses La Weilve type sun and planet gear to constitute, but is not limited to such formation.For example; Secondary speed-changing mechanism 30 also can constitute common sun and planet gear with the combination of friction coupling components, perhaps also can be through the structure of utilizing the different a plurality of gear clusters of ratio of number of teeth a plurality of power transfer path that constitute and the friction coupling components that switches these power transfer path to constitute.

In addition, possess oil

hydraulic cylinder

23a, 23b as the movable circular cone plate that makes

belt wheel

21,22 at the actuator of direction of principal axis displacement, still, actuator is not limited to oil pressure actuated, also can drive by electricity.

Claims

1. idle stop vehicle, it makes drive force source stop in vehicle ', it is characterized in that possessing:

Oil pump, its oil circuit that is rotated in through said drive force source produces main the pressure;

Speed-changing mechanism, it can infinitely be changed converter speed ratio by the winding diameter of the band of belt wheel clamping through using said main pressure change;

Secondary speed-changing mechanism, it is connected in series with respect to said speed-changing mechanism, and uses said main coupled situation of pressing a plurality of friction coupling components of change, can change the speed change level of level;

The idle running shutdown feature, it judges that in vehicle ' the idle running that execution stops the rotation of said drive force source stopped when establishment and the said idle running stop condition of idle running stop condition had been set up,

Said idle running shutdown feature possesses forbids the shutdown feature that dallies; It is when judging that said idle running stop condition is set up; Be predicted as under the situation of connection power of said friction coupling components that band Clamping force that the execution that stops through idle running makes said belt wheel is lower than coupled situation, forbid that idle running stops.

2. idle stop vehicle as claimed in claim 1 is characterized in that, said idle running shutdown feature is carried out said idle running and stopped, and, make the said friction coupling components in the connection become release position.

3. according to claim 1 or claim 2 idle stop vehicle; It is characterized in that; When judging the condition establishment that said idle running stops, and, when the friction coupling components that possesses energy storage in the oil circuit in said a plurality of friction means, that supply with oil pressure is coupled situation; Whether the condition no matter said idle running stops to be set up, and the said shutdown feature of forbidding dallying forbids that all idle running stops.

4. according to claim 1 or claim 2 idle stop vehicle is characterized in that,

Possess: electromagnetic valve and pressure regulating valve, said pressure regulating valve is pressed control valve opening according to the control of being undertaken by said electromagnetic valve after the pressure regulation,

When judging the condition establishment that said idle running stops; And; When being coupled situation through the friction coupling components of controlling coupled situation by the main pressure of said pressure regulating valve adjusting, whether the condition no matter said idle running stops to be set up, and the said shutdown feature of forbidding dallying forbids that all idle running stops.

5. idle stop vehicle as claimed in claim 3 is characterized in that,

6. the idle running method of shutting down of an idle stop vehicle in vehicle ', stops drive force source, and said idle stop vehicle possesses: oil pump, and its rotation through said drive force source produces main the pressure; Speed-changing mechanism, it can infinitely be changed converter speed ratio by the winding diameter of the band of one group of belt wheel clamping through using said main pressure change; Secondary speed-changing mechanism, it is connected in series with respect to said speed-changing mechanism, and uses said main coupled situation of pressing a plurality of friction coupling components of change, can change the speed change level of level, and this idle running method of shutting down is characterised in that to possess following step:

In vehicle ', judge the establishment of idle running stop condition;

When the condition that stops when said idle running has been set up, the rotation of said drive force source is stopped, carrying out idle running and stops, and, make the said friction coupling components in the connection become release position;

Be predicted as under the situation of connection power of said friction coupling components that band Clamping force that the execution that stops through idle running makes said belt wheel is lower than coupled situation, whether the condition no matter said idle running stops to be set up, and forbids that all idle running stops.